Turn off your Lyman 4500 heater if it's on, then unplug the power cord from the wall outlet.
Insert the heater element into the bottom, rear portion of the Lyman 4500 heater.
Insert a 10-32 size Allen screw into hole above the heater element for securing it into place.
Tighten the Allen screw using a 3/32 Allen wrench, but don't overly tighten the screw.
Plug the power cord back into the wall outlet. The heater element will then be fully installed.